import net.openhft.chronicle.map.ChronicleMap; import java.io.IOException; public class Main { public static void main(String[] args) throws IOException { ChronicleMap<String, Long> map = ChronicleMap .of(String.class, Long.class) .name("my-huge-map") .entries(1000000) .averageValueSize(8) .createPersistedTo(new File("/path/to/map.dat")); map.put("key1", 100L); map.put("key2", 200L); Long value1 = map.get("key1"); Long value2 = map.get("key2"); System.out.println("Value 1: " + value1); System.out.println("Value 2: " + value2); map.close(); } }